Examining the difference in election outcome between FPTP and D’Hondt (proportional representation).

In this short article I am exploring what the Dutch political landscape would look like if it operated under a first-past-the-post (FPTP) system.
The election data for the Netherlands was downloaded from the Kiesraad. The shapefile was downloaded from ESRI NL.
These are the 2021 results summarised:
| party | votes | seats | percentage |
|---|---|---|---|
| VVD | 2279126 | 34 | 22.3 |
| D66 | 1565862 | 24 | 15.3 |
| PVV | 1124482 | 17 | 11.0 |
| CDA | 990601 | 15 | 9.7 |
| PvdA | 597192 | 9 | 5.8 |
| SP | 623371 | 9 | 6.1 |
| FvD | 523083 | 8 | 5.1 |
| GROENLINKS | 537308 | 8 | 5.3 |
| PvdD | 399751 | 6 | 3.9 |
| ChristenUnie | 351275 | 5 | 3.4 |
| DENK | 211238 | 3 | 2.1 |
| JA21 | 246620 | 3 | 2.4 |
| SGP | 215249 | 3 | 2.1 |
| Volt | 252480 | 3 | 2.5 |
| BBB | 104319 | 1 | 1.0 |
| BIJ1 | 87238 | 1 | 0.9 |
| Partij 50PLUS | 106702 | 1 | 1.0 |
Let’s start with examining the composition of the Tweede Kamer - under a proportional representation (D’Hondt) system. This is what the Tweede Kamer looks like currently:

Now let’s have a look at what it would look like under First-past-the-Post (FPTP), with one MP elected per Gemeente.

Now, there are a couple of obvious differences:
But also some obvious caveats:
We can also show these results on a map - this in an interactive map which allows you to explore the individual election results for each Gemeente.